一、在$□$里填合适的数。
$9 + □ = 15$
$□ + 10 = 15$
$9 + □ = 17$
$□ - 9 = 7$
$8 + □ = 10$
$□ + 7 = 10$
$2 + □ = 13$
$□ - 9 = 1$
$6 + □ = 17$
$□ - 9 = 2$
$9 + □ = 14$
$□ + 2 = 9$
$9 + □ = 12$
$12 - □ = 2$
$4 + □ = 16$
$10 + □ = 16$
$□ + 9 = 18$
$□ - 9 = 4$
$□ + 10 = 14$
$□ - 9 = 8$
$□ + 9 = 19$
$□ - 9 = 5$
$9 + □ = 16$
$10 + □ = 17$
$9 + □ = 11$
$□ - 9 = 3$
$9 + □ = 13$
$□ - 9 = 9$
$□ + 6 = 10$
$7 - □ = 7$

一、6 5 8
16 2 3
11 10 11
11 5 7
3 10 12
6 9 13
4 17 10
14 7 7
2 12 4
18 4 0

二、在$◯$里填“＞”“＜”或“=”。
$13 - 9 ◯ 5$
$10 ◯ 18 - 9$
$11 - 9 ◯ 2$
$18 - 9 ◯ 2 + 7$
$9 + 7 ◯ 9 + 8$
$16 - 9 ◯ 14 - 9$
$15 - 9 ◯ 9 + 5$
$4 + 3 ◯ 17 - 9$
$2 + 7 ◯ 12 - 9$

二、＜ ＞ =
= ＜ ＞
＜ ＜ ＞